To Evaluate Sperm Parameters in Men With Secondary Hypogonadism Previously Treated With Topical Testosterone

Inclusion Criteria: * Healthy adult males between 21 and 60 years of age who have been diagnosed with AIHH. * Subjects must have been treated with a topical testosterone replacement therapy (typically AndroGel® or Testim®) for at least 6 months at enrollment and for not more than 2 years. Exclusion Criteria: * A history of idiopathic infertility due to primary hypogonadism, testicular failure, Kallmann's syndrome or any other infertility condition. * Subjects demonstrating any clinically significant medical condition rendering the subjects infertile or marginally fertile other than AIHH. * Men with a history of, known, or suspected prostate disease not ruled out by a prostate biopsy, or a prostate specific antigen (PSA)\>3.6 or clinical suspicion of current prostate disease. * Men with a hematocrit in excess of 50 % or hemoglobin \>17 g/dl